Honestly, it's really good! If you're looking for action plot alternate universe kind of story, this is definately for you. Sadly, it's only has two chapters so far, and the BL hints haven't showed up (yet?).

It's extremely slashy, but it's not shounen-ai. In the sense that Nabari no Ou isn't shounen-ai anyway. Sorry if that bursts any bubbles. Follows the Keisuke arc of the game pretty closely. Art is beautiful and clean. Fast paced action, good story, and good fighting scenes. I hope there will be other volumes that follow the other arcs of the game, but I'm not holding my breath for it. :x Highly recommended.